Excitabletom
Member
This has been the snowmobile season from hell! I bought a very nice looking 97 SX 700 this fall with 6200 miles. Being an experienced snowmobiler, I checked it out real well, or so I thought. I took it to a mechanic pre-seaon to have the carbs cleaned and synronized.
While it was there, I asked him to give it a check-over. The W bracket was broke and most of the rear suspension needed new bearings, bushing, slides, etc. That was expensive, but at least I will have a dependable sled, right?
First ride I had overheat issues. I took it back and had the water pump mechanical seal replaced. Now, 200 miles later, this:
Symptoms: The sled was always harder to start than I'm used to with Yamahas, especially when the engine was warm. I had to hold the throttle wide open to start a warm engine.
Next, while riding today, I noticed that once I let off from high speeds, the motor was real boggy to get the rpm's and speed back up. I thought I better rebuild the secondary soon.
A few miles later at 50 mph, the motor just shut-off. I knew I was in trouble, but I tried to slowly pull the starter rope to feel what happened and the motor was stuck hard. I checked all three plugs and they looked good (the middle one had a stripe on the elctrode, but still mostly good looking.) I then tried to turn the motor by hand at the primary clutch and it turned about 4/5 of the way "normal", then got hard to turn. I could muscle it past the tight spot for another turn, then tight again. We towed it out of the woods.
My buddy and I have a strong idea, but I want to hear your ideas first. Did I mention the wife is pissed at blowing a second snowmobile motor this season!?!
While it was there, I asked him to give it a check-over. The W bracket was broke and most of the rear suspension needed new bearings, bushing, slides, etc. That was expensive, but at least I will have a dependable sled, right?
First ride I had overheat issues. I took it back and had the water pump mechanical seal replaced. Now, 200 miles later, this:
Symptoms: The sled was always harder to start than I'm used to with Yamahas, especially when the engine was warm. I had to hold the throttle wide open to start a warm engine.
Next, while riding today, I noticed that once I let off from high speeds, the motor was real boggy to get the rpm's and speed back up. I thought I better rebuild the secondary soon.
A few miles later at 50 mph, the motor just shut-off. I knew I was in trouble, but I tried to slowly pull the starter rope to feel what happened and the motor was stuck hard. I checked all three plugs and they looked good (the middle one had a stripe on the elctrode, but still mostly good looking.) I then tried to turn the motor by hand at the primary clutch and it turned about 4/5 of the way "normal", then got hard to turn. I could muscle it past the tight spot for another turn, then tight again. We towed it out of the woods.
My buddy and I have a strong idea, but I want to hear your ideas first. Did I mention the wife is pissed at blowing a second snowmobile motor this season!?!
